Message
SyntaxError: identifier starts immediately after numeric literal (Firefox) SyntaxError: Unexpected number (Chrome)
Error type
What went wrong?
变量名叫identifiers，它符合某些规则，而你打破了这些规则！
一个JavaScript标识符必须以字母开头，下划线（_）或美元符号（$）。他们不能以数字开头。只有后续字符可以是数字（0-9）。
Examples
Variable names starting with numeric literals
Variable names can't start with numbers in JavaScript. The following fails:
var 1life = 'foo'; // SyntaxError: identifier starts immediately after numeric literal var foo = 1life; // SyntaxError: identifier starts immediately after numeric literal
You will need to rename your variable to avoid the leading number.
var life1 = 'foo'; var foo = life1;